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INVESTMENT SECURITIES (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
item
Jun. 30, 2011
Jun. 30, 2012
item
Jun. 30, 2011
Dec. 31, 2011
item
Available for Sale, Amortized Cost          
Due in one year or less $ 180,546,000   $ 180,546,000    
Due after one year through five years 202,455,000   202,455,000    
Due after five years through ten years 34,324,000   34,324,000    
Due after ten years 76,637,000   76,637,000    
Mortgage-backed securities 1,115,487,000   1,115,487,000    
Other 848,000   848,000    
Total 1,610,297,000   1,610,297,000    
Available for Sale, Estimated Fair Value          
Due in one year or less 181,200,000   181,200,000    
Due after one year through five years 205,522,000   205,522,000    
Due after five years through ten years 35,004,000   35,004,000    
Due after ten years 77,079,000   77,079,000    
Mortgage-backed securities 1,132,850,000   1,132,850,000    
Other 869,000   869,000    
Total 1,632,524,000   1,632,524,000   1,492,994,000
Held to Maturity, Amortized Cost          
Mortgage-backed securities 487,000   487,000    
Held to Maturity, Estimated Fair Value          
Mortgage-backed securities 495,000   495,000    
Other disclosures          
Gross proceeds from sale of available for sale investment securities 2,700,000 5,300,000 2,695,000 5,324,000  
Gross realized gains on the sales of the available for sale investment securities   300,000      
Gross realized losses on the sales of the available for sale investment securities            
Investment securities pledged to party with no right to sell or repledge the collateral 871,200,000   871,200,000   938,000,000
Number of investment securities in an unrealized loss position 50   50   9
Maximum
          
Other disclosures          
Gross realized gains on the sales of the available for sale investment securities $ 1,000